RT Book, Section A1 Rozenfeld, Ranna A. SR Print(0) ID 1152488404 T1 ICU Delirium T2 The PICU Handbook YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259834370 LK accesspediatrics.mhmedical.com/content.aspx?aid=1152488404 RD 2024/03/29 AB Delirium: A form of acute and fluctuating global cerebral dysfunction caused by the direct physiologic consequences of a general medication condition and characterized by disturbances in attentiveness and awareness and cognitive impairment affecting memory, cerebral orientation, language, perception, and/or visual or auditory hallucinations. Four current subtypes exist:Hyperactive: The “classic” form of delirium and intensive care unit psychosis featuring episodic or progressive agitation, restlessness, hallucinations, delusions, and/or emotional lability. Most easily recognized subtype by providers and family members.Hypoactive: Can also be referred to as “encephalopathy of critical illness” with decreased responsiveness, blunted levels of consciousness, quiet confusion, and apathy. Oftentimes can be confused with depressive symptoms or acute stress disorders.Mixed: Waxing and waning occurrences of both hyperactive and hypoactive delirium throughout its fluctuating course.Subacute: Usually related to an indolent, progressive medical condition over time with occasional occurrences of either hyperactive delirium or hypoactive delirium or both that is not defined by an additional psychiatric diagnosis.